diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 013993c..7d54494 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -490,6 +490,7 @@
 	select CPU_ARM926T
 	select ARCH_REQUIRE_GPIOLIB
 	select GENERIC_GPIO
+	select COMMON_CLKDEV
 	help
 		Support for Nuvoton (Winbond logic dept.) ARM9 processor,You
 		can login www.mcuos.com or www.nuvoton.com to know more.
diff --git a/arch/arm/mach-w90x900/Makefile b/arch/arm/mach-w90x900/Makefile
index 6287268..d50c94f 100644
--- a/arch/arm/mach-w90x900/Makefile
+++ b/arch/arm/mach-w90x900/Makefile
@@ -4,7 +4,7 @@
 
 # Object file lists.
 
-obj-y				:= irq.o time.o mfp-w90p910.o gpio.o
+obj-y				:= irq.o time.o mfp-w90p910.o gpio.o clock.o
 
 # W90X900 CPU support files
 
diff --git a/arch/arm/mach-w90x900/clock.c b/arch/arm/mach-w90x900/clock.c
new file mode 100644
index 0000000..f420613
--- /dev/null
+++ b/arch/arm/mach-w90x900/clock.c
@@ -0,0 +1,77 @@
+/*
+ * linux/arch/arm/mach-w90x900/clock.c
+ *
+ * Copyright (c) 2008 Nuvoton technology corporation
+ *
+ * Wan ZongShun <mcuos.com@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/string.h>
+#include <linux/clk.h>
+#include <linux/spinlock.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+
+#include "clock.h"
+
+static DEFINE_SPINLOCK(clocks_lock);
+
+int clk_enable(struct clk *clk)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&clocks_lock, flags);
+	if (clk->enabled++ == 0)
+		(clk->enable)(clk, 1);
+	spin_unlock_irqrestore(&clocks_lock, flags);
+
+	return 0;
+}
+EXPORT_SYMBOL(clk_enable);
+
+void clk_disable(struct clk *clk)
+{
+	unsigned long flags;
+
+	WARN_ON(clk->enabled == 0);
+
+	spin_lock_irqsave(&clocks_lock, flags);
+	if (--clk->enabled == 0)
+		(clk->enable)(clk, 0);
+	spin_unlock_irqrestore(&clocks_lock, flags);
+}
+EXPORT_SYMBOL(clk_disable);
+
+void w90x900_clk_enable(struct clk *clk, int enable)
+{
+	unsigned int clocks = clk->cken;
+	unsigned long clken;
+
+	clken = __raw_readl(W90X900_VA_CLKPWR);
+
+	if (enable)
+		clken |= clocks;
+	else
+		clken &= ~clocks;
+
+	__raw_writel(clken, W90X900_VA_CLKPWR);
+}
+
+void clks_register(struct clk_lookup *clks, size_t num)
+{
+	int i;
+
+	for (i = 0; i < num; i++)
+		clkdev_add(&clks[i]);
+}
diff --git a/arch/arm/mach-w90x900/clock.h b/arch/arm/mach-w90x900/clock.h
new file mode 100644
index 0000000..4f27bda
--- /dev/null
+++ b/arch/arm/mach-w90x900/clock.h
@@ -0,0 +1,36 @@
+/*
+ * linux/arch/arm/mach-w90x900/clock.h
+ *
+ * Copyright (c) 2008 Nuvoton technology corporation
+ *
+ * Wan ZongShun <mcuos.com@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License.
+ */
+
+#include <asm/clkdev.h>
+
+void w90x900_clk_enable(struct clk *clk, int enable);
+void clks_register(struct clk_lookup *clks, size_t num);
+
+struct clk {
+	unsigned long		cken;
+	unsigned int		enabled;
+	void			(*enable)(struct clk *, int enable);
+};
+
+#define DEFINE_CLK(_name, _ctrlbit)			\
+struct clk clk_##_name = {				\
+		.enable	= w90x900_clk_enable,		\
+		.cken	= (1 << _ctrlbit),		\
+	}
+
+#define DEF_CLKLOOK(_clk, _devname, _conname)		\
+	{						\
+		.clk		= _clk,			\
+		.dev_id		= _devname,		\
+		.con_id		= _conname,		\
+	}
+
diff --git a/arch/arm/mach-w90x900/cpu.h b/arch/arm/mach-w90x900/cpu.h
index de29ddc..57b5dba 100644
--- a/arch/arm/mach-w90x900/cpu.h
+++ b/arch/arm/mach-w90x900/cpu.h
@@ -41,7 +41,7 @@
 extern void w90x900_init_irq(void);
 extern void w90p910_init_io(struct map_desc *mach_desc, int size);
 extern void w90p910_init_uarts(struct w90x900_uartcfg *cfg, int no);
-extern void w90p910_init_clocks(int xtal);
+extern void w90p910_init_clocks(void);
 extern void w90p910_map_io(struct map_desc *mach_desc, int size);
 extern struct platform_device w90p910_serial_device;
 extern struct sys_timer w90x900_timer;
diff --git a/arch/arm/mach-w90x900/include/mach/clkdev.h b/arch/arm/mach-w90x900/include/mach/clkdev.h
new file mode 100644
index 0000000..04b37a8
--- /dev/null
+++ b/arch/arm/mach-w90x900/include/mach/clkdev.h
@@ -0,0 +1,7 @@
+#ifndef __ASM_MACH_CLKDEV_H
+#define __ASM_MACH_CLKDEV_H
+
+#define __clk_get(clk) ({ 1; })
+#define __clk_put(clk) do { } while (0)
+
+#endif
diff --git a/arch/arm/mach-w90x900/mach-w90p910evb.c b/arch/arm/mach-w90x900/mach-w90p910evb.c
index 1968ed4..7a62bd3 100644
--- a/arch/arm/mach-w90x900/mach-w90p910evb.c
+++ b/arch/arm/mach-w90x900/mach-w90p910evb.c
@@ -247,7 +247,7 @@
 static void __init w90p910evb_map_io(void)
 {
 	w90p910_map_io(w90p910_iodesc, ARRAY_SIZE(w90p910_iodesc));
-	w90p910_init_clocks(0);
+	w90p910_init_clocks();
 }
 
 static void __init w90p910evb_init(void)
diff --git a/arch/arm/mach-w90x900/w90p910.c b/arch/arm/mach-w90x900/w90p910.c
index 87214b8..1c97e49 100644
--- a/arch/arm/mach-w90x900/w90p910.c
+++ b/arch/arm/mach-w90x900/w90p910.c
@@ -34,6 +34,7 @@
 #include <mach/regs-serial.h>
 
 #include "cpu.h"
+#include "clock.h"
 
 /* Initial IO mappings */
 
@@ -52,6 +53,43 @@
 	/*IODESC_ENT(LCD),*/
 };
 
+/* Initial clock declarations. */
+static DEFINE_CLK(lcd, 0);
+static DEFINE_CLK(audio, 1);
+static DEFINE_CLK(fmi, 4);
+static DEFINE_CLK(dmac, 5);
+static DEFINE_CLK(atapi, 6);
+static DEFINE_CLK(emc, 7);
+static DEFINE_CLK(usbd, 8);
+static DEFINE_CLK(usbh, 9);
+static DEFINE_CLK(g2d, 10);;
+static DEFINE_CLK(pwm, 18);
+static DEFINE_CLK(ps2, 24);
+static DEFINE_CLK(kpi, 25);
+static DEFINE_CLK(wdt, 26);
+static DEFINE_CLK(gdma, 27);
+static DEFINE_CLK(adc, 28);
+static DEFINE_CLK(usi, 29);
+
+static struct clk_lookup w90p910_clkregs[] = {
+	DEF_CLKLOOK(&clk_lcd, "w90p910-lcd", NULL),
+	DEF_CLKLOOK(&clk_audio, "w90p910-audio", NULL),
+	DEF_CLKLOOK(&clk_fmi, "w90p910-fmi", NULL),
+	DEF_CLKLOOK(&clk_dmac, "w90p910-dmac", NULL),
+	DEF_CLKLOOK(&clk_atapi, "w90p910-atapi", NULL),
+	DEF_CLKLOOK(&clk_emc, "w90p910-emc", NULL),
+	DEF_CLKLOOK(&clk_usbd, "w90p910-usbd", NULL),
+	DEF_CLKLOOK(&clk_usbh, "w90p910-usbh", NULL),
+	DEF_CLKLOOK(&clk_g2d, "w90p910-g2d", NULL),
+	DEF_CLKLOOK(&clk_pwm, "w90p910-pwm", NULL),
+	DEF_CLKLOOK(&clk_ps2, "w90p910-ps2", NULL),
+	DEF_CLKLOOK(&clk_kpi, "w90p910-kpi", NULL),
+	DEF_CLKLOOK(&clk_wdt, "w90p910-wdt", NULL),
+	DEF_CLKLOOK(&clk_gdma, "w90p910-gdma", NULL),
+	DEF_CLKLOOK(&clk_adc, "w90p910-adc", NULL),
+	DEF_CLKLOOK(&clk_usi, "w90p910-usi", NULL),
+};
+
 /* Initial serial platform data */
 
 struct plat_serial8250_port w90p910_uart_data[] = {
@@ -81,8 +119,9 @@
 
 /*Init W90P910 clock*/
 
-void __init w90p910_init_clocks(int xtal)
+void __init w90p910_init_clocks(void)
 {
+	clks_register(w90p910_clkregs, ARRAY_SIZE(w90p910_clkregs));
 }
 
 static int __init w90p910_init_cpu(void)